Remove leftover LWLockRelease() call

This code was refactored in d5497b95 but an extra LWLockRelease call was
left behind.

Per report from Erik Rijkers

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/fa12cb7f0241c767a072c980d75780c9ec036e01

Modified Files
--------------
src/backend/access/transam/xlogarchive.c |    1 -
1 files changed, 0 insertions(+), 1 deletions(-)

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